Gigabit NIC slow upload on 1.0Gbps, but ok on 100 Mbps

nicbizz

Distinguished
Mar 16, 2010
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18,510
Hello,

I have a PC with an onboard Realtek 8168 PCIe Gigabit connected to a D-Link 655 Gigabit router.

Here's the odd situation: when speed/duplex is set to 100Mbps, my upload speed using www.Speedtest.net is fine (~3.0 Mbps). However, when I switched it over to 1.0Gbps, it goes down all the way to 0.06 Mbps. Download speed is generally unaffected.

I can't tell which is the likely culprit!

Onboard NIC faulty/underpowered?
Faulty cable (highly doubt, I've tried 5+)?
Or is it a matter of settings? I turned off QoS and WISH on the router, but it didn't do much.

Any help would be appreciated. Thanks!

-Nick
 

timks

Honorable
Mar 22, 2012
1
0
10,510

Have you found a remedy for this yet? I have same hardware and a very similar problem.
 

nicbizz

Distinguished
Mar 16, 2010
7
0
18,510
Yup, I did.

After a little bit more research on the Interwebs, it turns out this is a somewhat common problem with on-board NIC cards, specifically those using RealTek drivers.

Perhaps its RealTek thats at fault entirely -- I plugged in a stand-alone TP-Link NIC (that uses RealTek drivers), still the same problem. Switching it to an Intel NIC (with different drivers) did the trick.

Hope it helps.

-Nick